sstock...You are correct.....I should have realized this, upon exaiming the manifold more closely, I see a faint trace where this spacer was at one time.....The curious thing is the studs are to short when the carburetor is installed, as the studs are basically flush with the top of the nuts....leaving no room for the spacer??? I'll have to replace the studs with longer ones, and obtain the spacer...Hopefully that will correct the problem... And yes the carb does have the vacuum hole.......